AOMIC SPECTRAL LINE BROADNING AND DATABASES FOR STELLAR PLASMA RESEARC • MILAN S. DIMITRIJEVIĆ
Outline 1.Needs for large line broadening dana set 2. Virtual Observatories and Astroinformatics 3. Databases for Spectral Line Shapes 4. Virtual Atomic and Molecular Data Center
- DEVELOPMENT OF COMPUTERS FOR EXAMPLE: PHOENIX CODE FOR MODELLING OF STELLAR ATMOSPHERES INCLUDES A PERMANENTLY GROWING DATABASA WITH ATOMIC DATA FOR MORE THAN 500 MILLIONS TRANSITIONS - SATELLITE BORNE SPECTROSCOPY
Part of Chi Lupi spectrum obtained with International Ultraviolet explorer (IUE) and with Godhard High Resolution Spectrograph on Hubble telescope (GHRS). One can see how lines of trace elements become more and more important.
Example of importance of Stark broadening in Ap stars (Multiplet 3) From Dimitrijević et al. 2007, A&A, 469, 681-686 6 SF2A, Semaine de l’Astrophysique française, Atelier PNPS, 3 juin 2014 Astronomical Observatory, Belgrade
INFORMATION AVALANCHE HUGE DATA COLLECTIONS Sloan Digital Sky Survay SDSS, Spectra of ~ 230 million objects Images 16 Terabytes - to download with 10Mb/s ~5 Months Catalogues 18 Terabytes – to download ~6m HUGE SURVAYS 8.4m LSST Telescope 30 Terabytes per night Petabyte order data collection
2. VIRTUAL OBSERVATORIES AND ASTROINFORMATICS Success of IUE and HST archives Idea of VirtualObservatory end 2000 2001-2005 FP5 Project ASTROPHYSICAL VIRTUAL OBSERVATORY – AVO EUROPEAN VIRTUAL OBSERVATORY- EURO-VO http://www.euro-vo.org IVOA 2002
VIRTUAL OBSERVATORY VO: ALL ASTRONOMICAL DATABASES IN YOUR PC DEMOCRATIZATION OF SCIENCE THIS REQUIRES THAT ALL PLAYERS SPEAK THE SAME LANGUAGE VO STANDARDS AND PROTOCOLS DEFINED AND ADOPTED WITHIN IVOA
ASTROINFORMATICS e-SCIENCE IN ASTRONOMY e-Science New way to do science – use of huge distributed data reservoirs FOURTH PARADIGM OF SCIENCE -observations -theory -experiment
ASTROINFORMATICS e-SCIENCE IN ASTRONOMY e-Science New way to do science – use of huge distributed data reservoirs FOURTH PARADIGM OF SCIENCE -observations -theory -experiment -DATA MINING – KNOWLEDGE DISCOVERY
3. DATABASES FOR SPECTRAL LINE SHAPES 1. Atomic Spectral Line Broadening Bibliographical Database – NIST 2. VALD Vienna Atomic Lines Database 3.BALSS – Bibliography on Atomic Line Shapes and Shifts 4. Griem's Tables 5. STARK-B
STARK-B Database for "Stark" broadening of isolated lines of atoms and ions in the impact approximation http://stark-b.obspm.fr • Calculated widths and shifts: more than 150 pubs ( 1984-2017) • SCP theory updated and operated by S. Sahal-Bréchot, M.S. Dimitrijević and colleagues •STARK B is currently developed at Paris Observatory • the database has been opened since September 2008: •It is a part of the atomic and molecular databases of the Paris Observatory •Link to SerVO - Serbian Virtual Observatory http://www.vamdc.org http//:servo.aob.rs •It is node of VAMDC- Virtual Atomic and Molecular Data Centre •it follows the standards of VAMDC and Virtual Observatories (Europe: IVOA International Virtual Observatory Alliance ) http://www.ivoa.net 21 21 Astronomical Observatory, Belgrade
Diagnostics and Modelling in Astrophysics: Understanding of the evolution of stars Thanks to considerable developments of • Ground based and space-born missions – Increased sensitivity (S/N) and spectral resolution – Sun abundances Powerful computers – Stellar interiors studies and Asterosimology opacities: a great number of lines of higly ionized elements are required • Nuclear processes : - formation of elements, chemical enrichment Interpretation of the faint observed spectrum : faint objects (white dwarfs), faint lines (trace elements) Line intensities + line profiles • Continuum • Spectroscopic diagnostics: • Temperatures - 35 SF2A, Semaine de l’Astrophysique française, Atelier PNPS, 3 juin 2014 pressure - Astronomical Observatory, Belgrade Abundances - Modelling of atmospheres Synthetic spectra: • a great number of lines of a same element are required – Radiative transfer • Chemical stratification of the atmosphere –
Diagnostics and Modelling in Laboratory and Technological plasmas Magnetic confinement fusion: moderately dense and hot plasmas – Inertial confinement fusion (laser fusion, ion-beam fusion): dense and very hot – plasmas Low temperatures plasmas – Lighting discharges – Analysis and interpretation of the spectrum in fusion devices Light elements in the divertor and edge plasma regions • Importance of Tin, Tungsten and impurities • Progress in low-energy light sources Discharge lamps and lighting : • optimisation of performances - Rare earth elements Dy, Ho, Ce: excellent radiation sources • SF2A, Semaine de l’Astrophysique française, Atelier PNPS, 3 juin 2014 3 HID ( High Intensity Discharge ): MH ( Metal Halide ) lamps, e.g. Dy I3, In I, ZnI3 • Astronomical Observatory, Belgrade 6 (LED light-emitting diodes) • Risques sanitaires Contrôle de qualité des aliments par analyse de leur composition chimique •
STARK-B: Next steps Insertion of MSE data(in progress) Insertion of little “applets” on line for users: extrapolation or interpolation along principal quantum numbers, charge of the radiating ions (isoelectronic sequences), charge of the ion collider homologous ions, Future: SCP code on line: STARK-C project Insertion of quantum data in intermediate coupling : SST + DW, AS especially adapted to highly charged ions and resonance lines (Sahal-Bréchot with Elabidi & Ben Nessib (2004 and after, an also with Dubau and Cornille 2007 and after ) SF2A, Semaine de l’Astrophysique française, Atelier PNPS, 3 juin 2014 37 Astronomical Observatory, Belgrade
VAMDC Idea Problems in A&M data community -LACK OF STANDARDS AND COMMON GUIDELINES -INTEROPERABILITY problem – prevents productive search and data mining -DATA EXCHANGE problem – informal, e- mails, ASCII files… -OVERLAPING OF EFFORTS
VAMDC IDEA -Majority of developers are Astronomers, Physicists, Chemicists – NEED OF HIRING COMPUTER ENGINEERS -DATA IDENTIFICATION PROBLEM -XML schemata keys not only for data exchange but also for data identification
Virtual Atomic and Molecular Data Center (VAMDC) started 2009 as an European FP7 project with aims -To build a secure, flexible and interoperable e-science environment based interface to the existing Atomic and Molecular databases
VAMDC
Astrophysics Fusion plasmas Lighting Atmospheric physics y S g Environment o e m L l a o s e r i s c n o h n c d e u t c o t o n r a s N
U Uppsala UCL U Cambridge Open U RAS U Cologne RFNC NIST Queen’s U CNRS U Vienna IVIC CeCalCULA AO Belgrade INA Italia
Astronomy Plasma science Atmospheric Science Technological plasmas Fusion community Radiation science Lightning industry
THANK YOU FOR ATTENTION
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